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Over the past 4 years I have had to work with some of the best web application developers I have ever met, unfortunately I have also had the miss-fortune of working with some of the worst developers on the planet.
With this in mind, while attending the Microsoft 2008 launch event,  I was very impressed to pick up a book entitled “the Developer Highway code : The drive for safer coding!” 
This book is fantastic, and has hundreds of coding guidelines and server configuration recommendations. And absolute MUST read for any ASP, ASP.NET developer and / or web server support staff.

The best bit, it is available as a free ebook, from Microsoft:
http://download.microsoft.com/documents/uk/msdn/devdave/mic472_dev_highway_all.pdf